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Efficiency of new ozone filters for NO$_2$ sensing and air depollution

Abstract : Specific filters can be used up-stream with metal oxide (MOX) gas sensors to trap ozone and allow the selective detection of NO2. These filtering media are based on nanoporous matrices doped with indigo-carmine that reacts selectively with O$_3$. The nanoporous materials, produced via the sol-gel process using functionalized silicon alkoxides as precursors, are tailored for the trapping of O$_3$. Depending on the nature of the filter, it is possible to entirely trap O$_3$ and allow NO$_2$ to partially pass over a certain range of concentration. For air depollution purpose, selected filters that efficiently trap both O$_3$ and NO$_2$ were exposed to harsh conditions under high concentrations of O$_3$ (350–475 ppb) and humidity (RH: 72%, T = 21 °C). Their trapping efficiency and lifetime are determined and compared with those of activated carbon.
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Submitted on : Wednesday, March 9, 2022 - 12:29:38 PM
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M. Othman, C. Théron, Marc Bendahan, L. Caillat, C. Rivron, et al.. Efficiency of new ozone filters for NO$_2$ sensing and air depollution. Sensors and Actuators B: Chemical, Elsevier, 2018, 265, pp.591-599. ⟨10.1016/j.snb.2018.03.019⟩. ⟨cea-01730619⟩



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